Unrated severityNVD Advisory· Published Dec 3, 2025· Updated Dec 3, 2025
Cal.com Authentication Bypass via bad TOTP + password checks
CVE-2025-66489
Description
Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an attacker to bypass password verification when a TOTP code is provided, potentially gaining unauthorized access to user accounts. This issue exists due to problematic conditional logic in the authentication flow. This vulnerability is fixed in 5.9.8.
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
1- github.com/calcom/cal.com/security/advisories/GHSA-9r3w-4j8q-pw98mitrex_refsource_CONFIRM
News mentions
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